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add (disabled) real linear resampler. quality is currently not as good

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as previous simpler implementation, but will be improved


git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@1291 423420c4-83ab-492f-b58f-81f9feb106b5
This commit is contained in:
Michael Gernoth 2006-10-02 08:01:24 +00:00
parent 7b6705553d
commit 3701080708
1 changed files with 42 additions and 0 deletions
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42
rdpsnd_dsp.c
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@ -300,17 +300,59 @@ rdpsnd_dsp_resample(unsigned char **out, unsigned char *in, unsigned int size,
for (i = 0; i < outsize / (resample_to_channels * samplewidth); i++)
{
int source = (i * 1000) / ratio1k;
#if 0 /* Partial for linear resampler */
int part = (i * 100000) / ratio1k - source * 100;
#endif
int j;
if (source * resample_to_channels + samplewidth > size)
break;
#if 0 /* Linear resampling, TODO: soundquality fixes */
if (samplewidth == 1)
{
sint8 cval1, cval2;
for (j = 0; j < resample_to_channels; j++)
{
memcpy(&cval1,
in + (source * resample_to_channels * samplewidth) +
(samplewidth * j), samplewidth);
memcpy(&cval2,
in + ((source + 1) * resample_to_channels * samplewidth) +
(samplewidth * j), samplewidth);
cval1 += (cval2 * part) / 100;
memcpy(*out + (i * resample_to_channels * samplewidth) +
(samplewidth * j), &cval1, samplewidth);
}
}
else
{
sint16 sval1, sval2;
for (j = 0; j < resample_to_channels; j++)
{
memcpy(&sval1,
in + (source * resample_to_channels * samplewidth) +
(samplewidth * j), samplewidth);
memcpy(&sval2,
in + ((source + 1) * resample_to_channels * samplewidth) +
(samplewidth * j), samplewidth);
sval1 += (sval2 * part) / 100;
memcpy(*out + (i * resample_to_channels * samplewidth) +
(samplewidth * j), &sval1, samplewidth);
}
}
#else /* Nearest neighbor search */
for (j = 0; j < resample_to_channels; j++)
{
memcpy(*out + (i * resample_to_channels * samplewidth) + (samplewidth * j),
in + (source * resample_to_channels * samplewidth) +
(samplewidth * j), samplewidth);
}
#endif
}
outsize = i * resample_to_channels * samplewidth;
#endif